Reciprocating hand pump and reservoir unit



Marcfi 16, 1954 YARGER' 2,672,014

RECIPROCATING HAND PUMP AND RESERVOIR UNIT Filed July 16, 1951 2Sheets-Sheet l March 16, 1954 D. L. YARGER 2,672,014

RECIPROCATING HAND PUMP AND RESERVOIR UNIT Filed July 16, 1951 2Sheets-Sheet 2 Patented Mar. 16 1954 2,672,014 RECIPR UCATLNQG ANDRESERVOIR UNIT Donald L'. -'a;rger, Garden- Prairie; Ill; Appiiautinuiili 1c, 1951, Serial N6. 2363963" mania (Cl: 60 -52 This inventionrelatesto' a' handoperatedpis witli'jtheoil' reservoir through anintermediate ton pump, and'in particular'to' spams offth'at' chamber ifand downwardly extending aligned type for operating hydraulic equipment'sil'cli as" conduits l4"; l5 normally closed by a spring hydraulic liftsfor dump trucks" or* farm mapressedballvalve' I6. .Within the pumpcylinder chinery. p lz'tliereisfprovideda'pump piston I1 carried'on Anobject of this inventionis tofprovide a'novel a5 reciprocable'stem I8which passes through a pump having a closed cycle'of operation whereinstufiingbox l9 at the rearof the pump cylinder; the fluid dischargedunder pressure during' one' A pair' of spaced parallel links 20, 2| arepivstep in the operating cycleis drawn'back'into'the otallyconnected atcross pin 22 to the stem 18 pump during a later step the operatingcyclei beyond the'pumpcasing. An upwardly extend- A further object ofthis invention is to provide ing handle 23' is pivotally connected atcross pin a lever-actuated piston'pump inwhich comple} 24*tothe1inlis2|. tion of the lever movement for retra ctinggthe Above the pumpcylinder there is provided'a piston draws-back into thepumpreserv r'ftherefcip'ro'cable plunger 25 which extends rearfluid which was discharged*the" preceding 15 wardly beyond the pump casingand which carpower strokeof'the piston. U p, ries at its rear end an enlarged bifurcated mem- A'still further objecfi'offth' iii ve'r'itionf is of her 26 which providesa transverse shoulder 21 provide a lever-actuatedpi'stbri pumpin w j I}atiits forward end. A coil spring 28 is interposed plurality ofvalves'are arrah" dto pe iiiit the between theplunger' shoulder 21 and aboss 29 discharge of fluid undei p ring the formed on the pump casing tonormally urge power stroke of'thefpuir'i pisto n plunger 25 to itsretracted position. A trans from the pump reservoir-into tli pu p c indverse pin'3'0 is attached to plunger 25 to limit in response toretraction*offth fpuf' rearward movement thereof by engaging the intoreturn to the-pump reser if t terior of the casing adjacent the aperturewas discharged inthe i-evi s po p, through'which plungerv 25 extends.Handle 23; the pumppisto'n in'respon e to c' pletiovfi o? extendsbetween the fur'cations of member 26 lever movement by whi' the r)hi1ip"plet'e'i'iisre and is pivotally connected thereto'by means of a heated.cross'pin'3l extending" between the furcations.

Otherand furtherob'i icts and-1 "are" are 1 th invention'will kfe appa[ii't from tl'i ffoll which handle 2 3 is adapted to swing. ingdescription of a prerrreu embeds-rent" Aligned with the plunger 25 thereis provided thereof; 7 an interiorbo'ss formation 32 of the pump casingIn the drawings:- p M p 7 Figure 1 is a perspective'vfew 'of tli pufiifrustoconical'seat 34 is-formed at the forward cording to one embodimentof tlie' presentunveriw end ofbo'refl and forms a valve seatfor releasetion. poppet valve member 35, which is of comple- Normally cross pin'3 lforms the fulcrum aboutthrough which extends a cylindrical bore 33. A'

Fig. 2 is a verticalsectiona -viewol thephmfi mentaryconical shape tonormally abut snugly of'Fig. 1. against' the seat 34; A rearwardly'extending Fig. 3 is a, fragmentary sectional view ofia setf stem'tsis-connected'to valve member 35 and is 0nd embodiment of the pump whichincorporates loosely received within the bore 33 to permit the adifferentdeverarrangement forroperatmg the passage of oil therethrough.Stem 36"is interpump: 7 g M Fig. 4 is a fragmentary.-'sectionalvievwori'the wheni'the latter isflactuated to its extreme forfirst formof the"inventioniflshowingz'thef-pitmpi wardpositie v parts whenthepumppistorr'isretractedzi I Exteridingfoiwardlyof'the pump cylinder[2' pose'd' inthe patlfo'f movement of'plunger' 25 Fig. 5v isasectionsixnilarftowFigi hermi -strov and communicating therewith is ahorizontal ing the positions of thej'pumpzpartswat the conr conduit '31"which interseets'the vertical conduit" pletion of the poweri'stiolfe'ofitheepmtom- Fig. '6 is a=section similar to Figsifit and5='-iSIfOWZ-'. tonor'mally clo'se the forward'end ofconduit fiig ingytheoperation of: the pumpwhenfitherhandlei Beyond'th'er forward endofcondu'it 3 there is 15. Af-spring 'piessed ball valve 381s positionedisactu'ated beyond-the fuily'retraeted position provided''a'notherhorizontal conduit et'which in of the piston. v Vterse'ctsconduit 3l at the sat for ba1lvalv'e38;

In the formof the: invention-:shewmiir Figsei At its other-end'conduit39is closed by asu-itable l and 2, the pump, includes-an oilre'seryoirzl i send; closure member extending through the casing apump yder]? mcu tedrhe wztheireservcip4 perture..,40:

The pump cylinderwlsmdaptedito communicate' n vertical conduitdi; closedat its lower end,

intersects conduit 33 and extends upwardly therefrom to intersect thehorizontal conduit 42 extending in alignment with bore 33 at the otherside of valve member 35. A discharge port 43 in the pressure line isformed in a boss member 44 at the forward side of the pump casing. Acheck valve 45 is normally urged by the pressure in the discharge lineto a position where it is seated against a shoulder 46 formed at theintersection of discharge port 43 and the conduit 42 to blockcommunication therebetween.

In the operation of the device, the oil reservoir H is filled to adesired level through the hole 41 formed in the top thereof. Afterinsertion of the closure member 48 into hole 4? the pump is ready tofunction under the actuation of handle 23.

To fill the pump cylinder 2 with oil the handle is moved angularly aboutits normal fulcrum 31 toward the pump casing to retract piston l'i.

The retraction of piston H creates a pressure differential between theoil reservoir and cylinder l2 sufficient to overcome the spring bias onball valve l3 and open the latter. Oil flows downwardly through conduitl to fill the pump cylinder l2 in front of piston ii.

To discharge the oil from cylinder I2 the hen dle is moved angularlyabout its fulcrum in the opposite direction, away from the pump casing.Through its pivotal linkage with the handle the piston ll is pushedforwardly to expel the oil from the cylinder. The resulting oil pressurebehind ball valve 33 opens the latter against the action of its normalspring bias. The oil then rises up through conduit ii and opens check 2*valve 45 to flow therebeyond to the discharge port 43 in the pressureline. During this action ball valve is seated by its spring bias and bythe oil pressure from the forward movement of piston I! to close conduit15. In like manner release poppet valve 35 is also seated during thisaction.

After completion of the forward movement of piston ll, the handle isagain moved toward the pump casing to retract the piston and refill thecylinder It. In order to relieve the oil pressure on the operatingcylinder connected to the outlet of discharge port 43, the poppet valveis opened after the piston has been fully retracted. After the retractedpiston it abuts against the stufiing box it the manual movement ofhandle 23 toward the pump casing is continued. As a result of thisfurther angular movement of the handle, the coil spring 28 is compressedand plunger is pushed forwardly to engage stem and unseat valve member35, which in turn pushes open check valve 45. During this furtherangular movement of handle 23, the pin 25 becomes the fulcrum aboutwhich it moves angularly and its normal fulcrum pin 3! is pushedforwardly in unison with plunger 25. The opening of release valve 35 andcheck valve 35 permits oil under pressure to flow back through dischargeport 43, conduit 42, and bore 33 into the intermediate chamber l3communicating with the oil reservoir. Thus, it will be seen that thereis provided a sealed system in which the oil discharged by the pumpduring forward movement of the pump piston is returned to the oilreservoir in response to completion of the handle movement forretracting the pump piston.

In the form of the invention shown in Fig. 3 the internal valve andconduit arrangement is the same as in the form shown in Fig. v2. How- 4ever, the lever arrangement for operating the pump piston and theplunger for opening the release poppet valve is different.

As shown in the drawing, a bifurcated memher as is rigidly secured tothe rear end of piston stem IS. A cross pin 53 on the member it forms apivotal connection for handle 22 to the piston stem.

Plunger 25 extends rearwardly through the pump casing and is attached atits rear end to an enlarged member 5| which provides a shoulder 52 atits forward end. Coil spring 28 is under compression between shoulder 52and easing boss 29 to normally bias plunger 25 to its retractedposition. Adjacent its rear end member 5| carries a cross pin 53. A pairof spaced parallel links 54 are'connected at one end to the cross pin 53and at their other ends are connected to the handle 23 through a crosspin Normally cross pin 53 forms the fulcrum about which handle 23 swingsthrough its linkage therewith by links 54.

In the operation of this form of the invention, to draw oil into thepump cylinder the handle 23 is moved angularly about cross pin 53 towardthe pump casing to retract the pump piston.

To discharge the oil from the pump cylinder the handle 23 is movedangularly about cross pin in a direction away from the pump casing topush the pump piston forwardly within the pump cylinder.

Next, the handle 23 is again moved angularly about cross pin 53 in adirection toward the pump casing to again retract the pump piston anddraw oil into the pump cylinder to be discharged in the next forwardmovement of the pump piston. To open the release poppet valve the handlemovement toward the pump casing is continued until the plunger 25 ispushed forwardly, against the urging of coil spring 28, to unseat therelease poppet valve in the manner described in connection with Fig. 2.This action occurs after the pump piston has been fully retracted, andduring this action the fulcrum about which handle 23 swings is the crosspin 53, by which the handle is pivotally connected to the piston stem.The cross pin 53, which normally is the fulcrum about which the hindleswings, is pushed forwardly in unison with the plunger 25 during thiscontinued movement of the handle toward the pump casing to open therelease poppet valve.

While there have been described preferred embodiments ofthe presentinvention it is to be understood that variations and modifications ofthe described forms may be resorted to without departing from the spiritand scope of the invention.

I claim:

1. A pump comprising a pump cylinder, a piston reciprocable within saidcylinder, a reservoir containing pump fluid, means responsive toretraction of said piston for effecting communication between saidreservoir and said pump cylinder to fill the latter with fluid forwardof the piston, said piston being operative upon forward movement toexpel fluid from said pump cylinder into a discharge line, valve meansnormally blocking communication between said discharge line and saidreservoir, a reciprocable plunger normally biased away from engagementwith said valve means, and a lever pivotally connected intermediate itsends to said plunger and at one end pivotally linked with said pumppiston, said lever being operative upon angular movement in onedirection aboutits. connection to. plunger to move said piston forwardwithin said pump cylinder to expel fluid therefrom-mile said dischargeline, said lever being operative upon angular movement in the oppositedirection about its connection to said plunger toretract said piston,said lever being operative after full retraction of said piston and uponcontinued angular movement in said opposite direction to pivot about itsconnect'ionto said piston and to move said plunger into engagement withsaid valve means to open the latter and permit fluid from said dischargeline to return to said reservoir.

2. A pump comprising a pump cylinder, a piston reciprocable within saidcylinder, a reservoir containing pump fluid, means effectingcommunication between said reservoir I and said pump cylinder duringretraction of the piston to flll the latter with fluid forward of thepiston, a discharge line adapted to communicate with the pump cylinderforward of the piston, a check valve normally blocking communicationbetween the pump cylinder and said discharge line and operative to openupon forward movement of the piston to pass fluid from the pump cylinderto said discharge line, a passage effecting communication between saiddischarge line and said reservoir and connected to said discharge'l-ineafter said check valve, valve means in said passage normally blockingcommunication between said discharge line and'said reservoir, movablepiston-operating means operatively connected to said piston forreciprocating the piston, said piston-operating means being operativewhen moved in one direction to move the piston forward in said pumpcylinder to efiect, opening of said check valve and to expel fluid fromthe pump cylinder to said dischargeline, said piston-operating meansbeing operative when moved in the opposite direction to retract thepiston to effect closing of said check valve and to draw fluid from saidreservoir into the pump cylinder, means for limiting retracting movementof said piston beyond a predetermined position, and means actuated bysaid piston-operating means in response to engagement of said pistonwith said limiting means and upon continued movement of said operatingmeans in the same direction after retraction of the piston to saidpredetermined position to effect opening of said valve means betweensaid discharge line and said reservoir for the return of fluid from saiddischarge line to said reservoir while said check valve is closed. 7

3. The pump of claim 2, wherein said pistonoperating means includes alever connected to the piston and movable in opposite directions toeffect movement of the piston, and wherein there is additionallyprovided a reciprocable plunger pivotally linked with said lever andmovable thereby to engage and open said valve means upon said continuedmovement of the lever after retraction of the piston.

4. A pump comprising a pump cylinder, a piston reciprocable within saidpump cylinder, a reservoir containing pump fluid, means effectingcommunication between said reservoir and said pump cylinder duringretraction of the piston to fill the pump cylinder with fluid forward ofthe piston, a discharge line adapted to communicate with the pumpcylinder forward of the piston, a check valve normally blockingcommunication between the pump cylinder and said discharge line andoperative to open upon forward movement of the piston to pass fluid fromthe pump cylinder .to saiddischargelinaa passage .eliec'c,v ingcommunication between said discharge one and said reservoir andconnected to said dis.- charge line after said, check valve, valve meansin said passage normally blocking communicae tion between said dischargeline and said res ervoir, a reciprocatoryplunger normally biased awayfrom en agement with said valve means and mounted for movement towardsaid valve means to engage and opensaid valve means for effectingcommunication between said discharge line and said reservoir, and alever pivotally linked intermediate its ends to said plunger and atoneend pivotally linked with said piston, said lever upon angularmovement in one direction about its connection with said plunger movingsaid piston forwardin the pump cylinder to effect opening of said checkvalve and to expel fluid from the pump cylinder to said discharge line,said lever upon angular movement in the opposite direction about itsconnection to said plunger retracting said piston and effectingclosingof said check valve, said lever after full retraction of said piston andupon continued angular movement in, said opposite direction pivote ingabout its connection vto said piston andmoving said plunger intoengagement with said valve means to open the latter and permit thereturn of fluid from saiddischarge'line to said reservoir while saidcheck valve remains closed and while said piston is retracted.

v5. .A' pump comprising a ;;pump, cylinder, a piston reciprocablewithinv said cylinder,,-a reservoir containing pump fluid, meanseflecting communi cation between said reservoir andsaid pump cylinderduring retraction .;of said piston to fill the pump cylinder with fluidforwardof the piston, a discharge line. adapted; ,to communicate -,with.the pump cylinder forwardofthe piston, a check valve jnormally blocking,communication between the pump cylinder and said discharge line andoperative to open upon forward movement of the piston to pass fluid fromthe pump cylinder to said discharge line, a passage effectingcommunication between said discharge line and said reservoir andconnected to said discharge line after said check valve, valve means insaid passage normallyblocking communication between said discharge lineand said reservoir, movable pistonoperating means operatively connectedto said piston for'reciprocating the piston, said pistonoperating meansbeing operative when moved in one direction to move the piston forwardin said pump cylinder to effect opening of said check valve and to expelfluid from the pump cylinder to said discharge line and operative whenmoved in another direction to retract the piston to eiiect closing ofsaid check valve and to draw fluid from said reservoir into the pumpcylinder, means for limiting retracting movement of said piston beyond apredetermined position, and means actuated by said piston-operatingmeans in response to engagement of said piston with said limiting meansand upon continued movement of said piston-operating means in said otherdirection after retraction of the piston to said predetermined positionto open said valve means between said discharge line and said reservoirfor the return of fluid from said discharge line to said reservoir whilesaid check valve is closed.

6. A pump comprising a pump cylinder, a piston reciprocable within saidpump cylinder, a discharge line connected to receive fluid expelled fromsaid pump cylinder, a reservoir containing pump fluid, means effectingcommunication bewas;

n Sai reservoir nd sa u dfllidlll: ingretraction of said piston to fillsaid pump cyl: inder forward of the piston, movable piston-operatingmeans connected with said piston for reciprocating the piston in thepump cylinder, said piston-operating means upon movement in onedirection moving the piston forward in said pump cylinder to expel fluidfrom the pump cylinder into said discharge'line, said piston-operating 1means upon movement in another direction retracting the piston to fillthe pump cylinder from the reservoir, meansfor limiting retractingmove-5 ment of said piston beyond a predetermined posi-;

tion, and means actuated by saidpiston-operate ing means in response toengagement of said piston with said limiting means and upon continuedmovement of said piston-operating means in said other direction afterretraction of the piston to said predetermined positionto eflfectcommuni-, cation between said discharge line and said reservoir for thereturn of fluid from said discharge line to said reservoir while thepiston is retracted.

7. A pump comprising a pump cylinder, a piston reciprocable within saidcylinder, a reservoir containing pump fluid, means elfectingcommunication between said reservoir and said pump cylinder duringretraction of the piston to fill the cylinder with fluid forward of thepiston, a discharge line communicating with the pump cylinder forward ofthe piston, a first check valve normally blocking communication beneaththe v pump cylinder and said discharge line and operative to open uponforward movement of the piston to pass fluid from the pump cylinder tosaid valve normally blocking communication between said dischargeconduit andpsaid discharge line and operative to open upon forwardmovement of said piston to discharge fluid from the pump cylinder, andmovable piston-operatingmeans operatively connected to said piston forreciprocating the piston, said piston-operating means being operativewhen moved in one direction to move the piston forward in said pumpcylinder to efiect opening of said first check valve and to expel fluidfrom the pump cylinder to the discharge line, said piston-operatingmeans being operative when moved in the opposite direction toretract thepiston to effect closing of said checkvalve and to draw fluid from thereservoir into the pump cylinder and being operative upon continuedmovement in the same direction after retraction of the piston to effectopening of said valve means and said second check valve for the returnof fluid from the discharge conduit to said reservoir whilethe firstcheck valve is closed.

DONALD L. YARGER.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,799,298 Jakob Apr. 7, 1931 2,107,970 Wells "Feb. 8, 19382,243,648 Patton et a1 May 27, 1941 2,254,084; Nilson Aug. 26, 19412,348,412 Pfauser May 9, 1944 2,539,739 Grime Jan. 30, 1951 FOREIGNPATENTS 7 Number Country Date 242,925 Great Britain Nov. 19, 1925358,692 Great Britain Oct. 15, 1931 588,798 Great Britain June 3, 1947

